Samsung ML-451 Series Service Manual page 224

4. Alignment and Troubleshooting
Check and cause
Transfer roller is contaminated.
11) Blank page
Description : The back of the page is stained.
Check and cause
The ground contact of the imaging unit is bad.
LSU is defective.
The connection between the main board and HVPS board
is bad.
12) Partial image void
Description : The partial void occurs in the printed page.
Check and cause
The printer is not installed on flat ground.
The developer circulation in the imaging unit is bad.
The contact between imaging unit and transfer roller is bad.
4-123
Solution
Replace the transfer roller.
Solution
Clean the ground terminal of the imaging unit. If the
problem persists, replace the imaging unit.
Replace the LSU.
Reconnect the harness. If the main board or HVPS board
is defective, replace it.
Solution
Install the printer on flat ground. Print 10 sample pages for
test.
1) Shake the imaging unit 2~3 times from right to left.
Reinstall the imaging unit. Print 10 sample pages
for test.
2) If the problem persists, replace the imaging unit.
Check if the imaging unit and transfer roller are installed
properly.
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